local shader = love.graphics.newShader(nil, [[
    float sdCircle(vec2 p, float r) {
        return length(p) - r;
    }
    vec4 effect( vec4 color, Image tex, vec2 uv, vec2 pos )
    {
        float d = sdCircle(pos / 20.0 - 0.5, 0.5);
        float c = smoothstep(-0.01, -0.08, d);
        float c2 = smoothstep(-0.1, - 0.09, d);
        vec3 rgb = mix(vec3(1.0), vec3(0.0), c2);
        return vec4(rgb, c);
    }
]])
ImageMaker:make("borderCircle20", 20, 20, shader)